Lower Portion Rupture of a Thrust Fault during the 2017 M-w 6.3 Jinghe Earthquake: Implications to Seismic Hazards in the Tian Shan Region

Hu Zongkai; Li Tao; Jobe Jessica Thompson; Yang Xiaoping

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Lower Portion Rupture of a Thrust Fault during the 2017 M-w 6.3 Jinghe Earthquake: Implications to Seismic Hazards in the Tian Shan Region

机译：2017年M-W 6.3京河地震期间，推力故障的下部破裂：对天山地区的地震危害的影响

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The 2017 M-w 6.3 Jinghe earthquake represents one of the few large earthquakes that are well recorded by seismic instruments and Interferometric Synthetic Aperture Radar (InSAR) observations in the seismically active Tian Shan region. In this study, we use the rupture fault solution (dip, dip direction, and slip sense) from seismologic and InSAR results, along with analysis of our collected surface mapping data, to determine the subsurface fault-plane geometry of the seismogenic Jinghenan fault. This geometric model, integrated with the coseismic slip distribution from seismologic and InSAR data, reveals that: (1) the Jinghenan fault extends downward from the land surface at a dip of similar to 46 degrees S (upper ramp), then bends to similar to 42 degrees S (lower ramp) at the depth of 9-13 km; (2) the coseismic rupture is confined within the Jinghenan lower ramp, and its upper limitation is approximately coincident with the fault-bend location. This coseismic rupture pattern and seismic behavior can be broadened to other active thrust faults within the Tian Shan, suggesting that, during moderate-strong earthquakes, such faults may only rupture partially in the down-dip extension, and the unruptured fault portion remains to pose high-seismic risk in the future.

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来源
《Seismological research letters》 |2021年第4期|共11页
作者
Hu Zongkai; Li Tao; Jobe Jessica Thompson; Yang Xiaoping;
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作者单位

China Earthquake Adm Inst Geol State Key Lab Earthquake Dynam Beijing Peoples R China;

China Earthquake Adm Inst Geol State Key Lab Earthquake Dynam Beijing Peoples R China;

Denver Fed Ctr Bur Reclamat Denver CO USA;

China Earthquake Adm Inst Geol State Key Lab Earthquake Dynam Beijing Peoples R China;

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正文语种 eng
中图分类地震学;
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Lower Portion Rupture of a Thrust Fault during the 2017 M-w 6.3 Jinghe Earthquake: Implications to Seismic Hazards in the Tian Shan Region

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